(Table 2) Major and trace elements in black smoker particulates


Autoria(s): Klevenz, Verena; Bach, Wolfgang; Schmidt, Katja; Hentscher, Michael; Koschinsky, Andrea; Petersen, Sven
Cobertura

MEDIAN LATITUDE: 5.536619 * MEDIAN LONGITUDE: -29.490768 * SOUTH-BOUND LATITUDE: -4.810670 * WEST-BOUND LONGITUDE: -44.980600 * NORTH-BOUND LATITUDE: 17.751000 * EAST-BOUND LONGITUDE: -12.371167 * DATE/TIME START: 2006-05-10T14:24:00 * DATE/TIME END: 2009-04-24T14:29:00 * MINIMUM DEPTH, sediment/rock: 0 m * MAXIMUM DEPTH, sediment/rock: 0 m

Data(s)

12/12/2011

Resumo

We present geochemical data of black smoker particulates filtered from hydrothermal fluids with seawater-dilutions ranging from 0-99%. Results indicate the dominance of sulphide minerals (Fe, Cu, and Zn sulphides) in all samples taken at different hydrothermal sites on the Mid-Atlantic Ridge. Pronounced differences in the geochemistry of the particles between Logatchev I and 5°S hydrothermal fields could be attributed to differences in fluid chemistry. Lower metal/sulphur ratios (Me/H2S < 1) compared to Logatchev I result in a larger amount of particles precipitated per liter fluid and the occurrence of elemental sulphur at 5°S, while at Logatchev I Fe oxides occur in larger amounts. Systematic trends with dilution degree of the fluid include the precipitation of large amounts of Cu sulphides at a low dilution and a pronounced drop with increasing dilution. Moreover, Fe (sulphides or oxides) precipitation increases with dilution of the vent fluid by seawater. Geochemical reaction path modeling of hydrothermal fluid-seawater mixing and conductive cooling indicates that Cu sulphide formation at Logatchev I and 5°S mainly occurs at high temperatures and low dilution of the hydrothermal fluid by seawater. Iron precipitation is enhanced at higher fluid dilution, and the different amounts of minerals forming at 5°S and Logatchev I are thermodynamically controlled. Larger total amounts of minerals and larger amounts of sulphide precipitate during the mixing path when compared to the cooling path. Differences between model and field observations do occur and are attributable to closed system modeling, to kinetic influences and possibly to organic constituents of the hydrothermal fluids not accounted for by the model.

Formato

text/tab-separated-values, 936 data points

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.772620

doi:10.1594/PANGAEA.772620

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Klevenz, Verena; Bach, Wolfgang; Schmidt, Katja; Hentscher, Michael; Koschinsky, Andrea; Petersen, Sven (2011): Geochemistry of vent fluid particles formed during initial hydrothermal fluid-seawater mixing along the Mid-Atlantic Ridge. Geochemistry, Geophysics, Geosystems, 12, Q0AE05, doi:10.1029/2011GC003704

Palavras-Chave #Aluminium; Area/locality; ATA-13ROV; ATA-17ROV; ATA-24ROV; ATA-30ROV; ATA-35ROV; ATA-42ROV; ATA-46ROV; ATA-57ROV; ATA-67ROV; Barium; Cadmium; Caesium; Calcium; Copper; DEPTH, sediment/rock; DERIDGE; Event label; From Mantle to Ocean: Energy-, Material- and Life-cycles at Spreading Axes; HYDROMAR-III; HYDROMAR-V; HYDROMAR-V-13; HYDROMAR-V-17; HYDROMAR-V-24; HYDROMAR-V-30; Hydrothermal fluid; ICP-MS, Inductively coupled plasma - mass spectrometry; ICP-OES, Inductively coupled plasma - optical emission spectrometry; Iron; L Atalante; LAtalante Leg1 (ATA07_12); LAtalante Leg2 (ATA08_01); Lead; M68/1; M68/1-03-ROV; M68/1-12-ROV; M68/1-20-ROV; M78/2; M78/2_281; M78/2_297; M78/2_308; Magnesium; Manganese; Maria S. Merian; MARSUED3; MARSUED5; MARSUED-IV; MARSUED-IV-35; MARSUED-IV-42; MARSUED-IV-46; MARSUED-IV-57; MARSUED-IV-67; Meteor (1986); Mid-Atlantic Ridge at 10-15°N; Mid-Atlantic Ridge at 4-11°S; Molybdenum; MSM04/3; MSM04/3_244-ROV-3; MSM04/3_244-ROV-7; MSM04/3_253-ROV-9; MSM04/3_255ROV-12; MSM04/3_255ROV-17; MSM04/3_255ROV-3; MSM04/3_255ROV-4; MSM04/3_259-ROV-25; MSM04/3_275-ROV-5; MSM04/3_275-ROV-7; MSM10/3; MSM10/3_290ROV-11; MSM10/3_313ROV-12; MSM10/3_315ROV-19; pH; Remote operated vehicle; ROV; Rubidium; Sample code/label; Strontium; Sulfur; Temperature, technical; tropical/subtropical North Atlantic; Tungsten; Uranium; Zinc
Tipo

Dataset